A drying device for active alumina production

Abstract

The utility model relates to active activated alumina production technical field especially relates to a drying device for active activated alumina production. Including support seat, a plurality of support seat top common fixed connection has the gas warehouse, the gas warehouse top fixed connection has dry outer tube, and the gas warehouse links together with dry outer tube. The utility model discloses through the rotation of the scraper driven by the fixing ring, and the scraper rotation can agitate the active activated alumina on the bearing plate, make it even heat, and the synchronous rotation of the mixing board and the scraper of one long and one short and reverse setting can overturn the active activated alumina that is accumulated to the dry outer tube and the bearing plate between, can make the active activated alumina containing moisture even heat on one hand, avoid its because local overwet and appear mutual adhesion phenomenon at the dead angle of dry outer tube and bearing plate, on the other hand can prevent the active activated alumina containing moisture and adhere on the bearing plate and dry outer tube, thereby ensured the subsequent quality and performance.

Description

Technical Field

[0001] This utility model relates to the field of activated alumina production technology, and in particular to a drying device for activated alumina production. Background Technology

[0002] Activated alumina is a porous, highly dispersed solid material with an extremely large specific surface area. With its excellent adsorption properties, mechanical strength, and surface characteristics, it plays a fundamental role in core areas such as industrial gas drying, water treatment, and petrochemical catalysis, and is an indispensable functional material in modern industrial systems. Existing drying equipment often suffers from uneven drying when drying activated alumina, which seriously affects the overall quality and pass rate of the product, thereby reducing production efficiency. Secondly, when the produced activated alumina is taken out of the high-temperature activation furnace, it will automatically absorb moisture from the air during cooling and storage. When processing activated alumina containing moisture, the particles are very prone to sticking and clumping due to the liquid bridging effect. This not only hinders the uniform evaporation of moisture and further aggravates uneven drying, but may also lead to difficulty in pulverizing the final product and a decline in performance. Utility Model Content

[0003] To overcome the problems of uneven drying that often occurs during the drying of activated alumina, and the fact that particles are prone to sticking and clumping due to the liquid bridging effect when processing activated alumina containing moisture, resulting in difficulty in pulverizing the final product and a decrease in performance, the technical problem to be solved is: to provide a drying device for the production of activated alumina.

[0004] Technical solution: A drying device for the production of activated alumina includes a support base, a gas conveying chamber, and a drying outer cylinder. The top of several support bases is fixedly connected to the gas conveying chamber, and the drying outer cylinder is fixedly connected to the top of the gas conveying chamber. The device also includes a feeding tray, and the feeding tray is fixedly connected to one end of the inner wall of the drying outer cylinder. Electric push rods are symmetrically installed on the outer wall of the drying outer cylinder. The output ends of two electric push rods are fixedly connected to a movable outer ring. The inner wall of the movable outer ring is in contact with the outer wall of the drying outer cylinder. The drying outer cylinder is equipped with a stirring mechanism to prevent activated alumina from sticking and clumping. Side plates are fixedly connected to one side of several support bases, and drying mechanisms for drying activated alumina are provided on the side plates.

[0005] In one embodiment, the stirring mechanism includes a connecting frame, a connecting frame fixed to the top of the drying outer cylinder, a first drive motor installed at the bottom of the connecting frame, a first rotating shaft fixed to the output shaft of the first drive motor, a support plate fixed to the inner wall of the drying outer cylinder, three sets of through holes arranged in a ring on the support plate, a fixed ring rotatably connected to the top center of the support plate, the top of the fixed ring being fixed to the first rotating shaft, and a plurality of scrapers fixed in a ring array on the outer wall of the fixed ring, the bottom of the scrapers being in contact with the inclined surface of the support plate, and one end of the scrapers being in contact with the inner wall of the drying outer cylinder.

[0006] In one embodiment, the stirring mechanism further includes a second rotating shaft, the tops of several scrapers are rotatably connected to the second rotating shaft, two stirring plates are fixed to the outer wall of the second rotating shaft, a limiting ring plate is fixed to the inner wall of the drying outer cylinder by a locking block, the top of the second rotating shaft is rotatably connected to the limiting ring plate, a gear is fixed to the outer wall of the second rotating shaft, and an internal gear ring is fixed to the inner wall of the drying outer cylinder, one side of the gear meshes with the internal gear ring.

[0007] In one embodiment, the drying mechanism includes an electric heating plate, an electric heating plate installed at the bottom of a support plate, a second drive motor installed on several side plates, a third rotating shaft fixedly connected to the output shaft of several second drive motors, a crank fixedly connected to the top of the third rotating shaft, a first connecting rod rotatably connected to the crank, a second connecting rod rotatably connected to one end of the first connecting rod, and a piston push plate fixedly connected to one end of the second connecting rod.

[0008] In one embodiment, the drying mechanism further includes a first pipe, which is connected through the outer wall of the drying outer cylinder, and a second pipe is connected through the outer wall of the air conveying chamber. The other end of the first pipe and the other end of the second pipe are connected to an air extraction housing. The second connecting rod and the piston push plate are located inside the air extraction housing and are slidably connected to the air extraction housing. One-way valves are fixedly connected to the ends of the first pipe and the second pipe away from the air extraction housing. The one-way valves open from top to bottom. The end of the second pipe extending into the air conveying chamber has an upward opening and is located on the side below the support plate and the electric heating plate. The end of the first pipe extending into the drying outer cylinder is located on the side below the feeding tray.

[0009] In one embodiment, it also includes an extrusion block. The inner wall of the movable outer ring is provided with a number of square grooves in an annular array. Each of the square grooves is slidably connected to an extrusion block. Each of the extrusion blocks is connected to a spring between it and the movable outer ring. One end of the extrusion block is in contact with the drying outer cylinder. The outer wall of the drying outer cylinder is provided with a number of discharge ports in an annular array. Each of the discharge ports is symmetrically fixed with a rotating rod. A sealing plate is rotatably connected between two rotating rods. A torsion spring is connected between the sealing plate and the rotating rod. The movable outer ring and the extrusion block can contact the sealing plate when they move.

[0010] Beneficial effects: 1. This utility model uses a fixed ring to drive the scraper to rotate. The rotation of the scraper can agitate the activated alumina on the support plate, making it evenly heated. At the same time, the rotation of the scraper drives the second rotating shaft, the stirring plate, and the gear to revolve around the limiting ring plate. Since the gear meshes with the internal gear ring, the gear will rotate along the teeth of the internal gear ring while revolving, which in turn drives the second rotating shaft and the stirring plate to rotate synchronously. The stirring plate, which is long and short and set in opposite directions, rotates synchronously with the scraper, which can turn over the activated alumina accumulated between the drying outer cylinder and the support plate. On the one hand, it can make the activated alumina containing moisture evenly heated, avoiding the phenomenon of mutual adhesion in the dead corner between the drying outer cylinder and the support plate due to local over-wetting. On the other hand, it can prevent the activated alumina containing moisture from adhering to the support plate and the drying outer cylinder, thereby ensuring the subsequent quality and performance.

[0011] 2. This utility model uses the pulling of the first connecting rod to move one end of the second connecting rod, which in turn moves the piston push plate. The pulling of the piston push plate, in conjunction with the one-way valve, allows air from the drying outer cylinder to enter the extraction housing along the first pipe. When the long end of the crank rotates close to the extraction housing, the first connecting rod pushes the second connecting rod, causing it to move and push the piston push plate inward. This, combined with the one-way valve, allows air from the extraction housing to exit through the opening of the second pipe. The air then blows against the electric heating plate, which heats the air. The air is then transported upward through the heat outlet and flows upward along the through-hole, further heating the activated alumina between the support plate and the drying outer cylinder, thus improving heating efficiency.

[0012] 3. This utility model uses the annular inclined surface on the outer wall of the bottom of the feeding tray to block the rising hot air, preventing the hot air from being directly discharged from the feeding tray. When the first pipe is evacuating, it can extract the hot air trapped at the bottom of the feeding tray, allowing the rising hot air to be recycled, improving the utilization rate of the hot air and ensuring the drying effect. Attached Figure Description

[0013] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a cross-sectional view of the drying outer cylinder structure of this utility model; Figure 3 This is a three-dimensional structural cross-sectional view of the present invention; Figure 4 This is a cross-sectional view of the drying mechanism of this utility model; Figure 5 This is a cross-sectional view of the movable outer ring structure of this utility model; Figure 6 This is a schematic diagram of the stirring plate structure of this utility model.

[0014] The components in the diagram are labeled as follows: 1-Support base, 2-Gas delivery chamber, 3-Drying outer cylinder, 301-Discharge port, 302-Rotating rod, 303-Sealing plate, 4-Electric push rod, 5-Moving outer ring, 6-Extrusion block, 7-Discharge tray, 8-Connecting frame, 9-First drive motor, 10-First rotating shaft, 11-Fixing ring, 12-Scraper, 13-Bearing plate, 14-Second rotating shaft, 15-Stirring plate, 16-Limiting ring plate, 17-Gear, 18-Internal gear ring, 19-Electric heating plate, 20-Side plate, 21-Second drive motor, 22-Third rotating shaft, 23-Crank, 24-First connecting rod, 25-Second connecting rod, 26-Evacuation housing, 27-Piston push plate, 28-First pipe, 29-Second pipe, 30-One-way valve. Detailed Implementation

[0015] The present invention will be further described below with reference to the embodiments shown in the accompanying drawings. Example

[0016] A drying device for the production of activated alumina, such as Figures 1-6 As shown, it includes a support base 1, a gas supply chamber 2, and a drying outer cylinder 3. The top of the four support bases 1 is fixedly connected to the gas supply chamber 2, and the top of the gas supply chamber 2 is fixedly connected to the drying outer cylinder 3. The gas supply chamber 2 and the drying outer cylinder 3 are connected. It also includes a feeding tray 7. The feeding tray 7 is fixedly connected to one end of the inner wall of the drying outer cylinder 3. The bottom outer wall of the feeding tray 7 is an annular inclined surface. Electric push rods 4 are symmetrically installed on the outer wall of the drying outer cylinder 3. The output ends of the two electric push rods 4 are fixedly connected to a movable outer ring 5. The inner wall of the movable outer ring 5 is in contact with the outer wall of the drying outer cylinder 3. The drying outer cylinder 3 is equipped with a stirring mechanism to prevent activated alumina from sticking and clumping. A side plate 20 is fixedly connected to one side of each of the four support bases 1. A drying mechanism for drying activated alumina is provided on the side plate 20.

[0017] The stirring mechanism includes a connecting frame 8. The connecting frame 8 is fixedly connected to the top of the drying outer cylinder 3. A first drive motor 9 is installed at the bottom of the connecting frame 8. The output shaft of the first drive motor 9 is fixedly connected to a first rotating shaft 10. A support plate 13 is fixedly connected to the inner wall of the drying outer cylinder 3. Three sets of through holes are opened in a ring array on the support plate 13. The top of the support plate 13 is a ring-shaped inclined surface. A fixing ring 11 is rotatably connected to the center of the top of the support plate 13. The top of the fixing ring 11 is fixedly connected to the first rotating shaft 10. Several scrapers 12 are fixedly connected in a ring array on the outer wall of the fixing ring 11. The bottom of the scrapers 12 is in contact with the inclined surface of the support plate 13, and one end of the scrapers 12 is in contact with the inner wall of the drying outer cylinder 3.

[0018] The stirring mechanism also includes a second rotating shaft 14, and the tops of several scrapers 12 are rotatably connected to the second rotating shaft 14. Two stirring plates 15 are fixed to the outer wall of the second rotating shaft 14. The two stirring plates 15 are arc-shaped with one long and one short and are arranged in opposite directions. The inner wall of the drying outer cylinder 3 is fixed to a limiting ring plate 16 by a locking block. The top of the second rotating shaft 14 is rotatably connected to the limiting ring plate 16. A gear 17 is fixed to the outer wall of the second rotating shaft 14, and an internal gear ring 18 is fixed to the inner wall of the drying outer cylinder 3. One side of the gear 17 meshes with the internal gear ring 18.

[0019] The drying mechanism includes an electric heating plate 19, which is installed at the bottom of the support plate 13. There is a gap between the electric heating plate 19 and the support plate 13, and the electric heating plate 19 is provided with heat outlet holes. Several side plates 20 are each equipped with a second drive motor 21. The output shafts of several second drive motors 21 are all fixedly connected to a third rotating shaft 22. The top of the third rotating shaft 22 is fixedly connected to a crank 23. A first connecting rod 24 is rotatably connected to the crank 23. One end of the first connecting rod 24 is rotatably connected to a second connecting rod 25. One end of the second connecting rod 25 is fixedly connected to a piston push plate 27.

[0020] The drying mechanism also includes a first pipe 28, which is connected through the outer wall of the drying outer cylinder 3, and a second pipe 29 is connected through the outer wall of the air supply chamber 2. The other end of the first pipe 28 and the other end of the second pipe 29 are connected to the suction housing 26. The second connecting rod 25 and the piston push plate 27 are located inside the suction housing 26 and are slidably connected to the suction housing 26. One-way valves 30 are fixedly connected to the ends of the first pipe 28 and the second pipe 29 away from the suction housing 26. The one-way valve 30 in the first pipe 28 is an air inlet valve, and the one-way valve 30 in the second pipe 29 is an exhaust valve. The end of the second pipe 29 extending into the air supply chamber 2 has an upward opening and is located on the side below the support plate 13 and the electric heating plate 19. The end of the first pipe 28 extending into the drying outer cylinder 3 is located on the side below the material feeding tray 7.

[0021] It also includes an extrusion block 6. The inner wall of the movable outer ring 5 is provided with a number of square grooves in an annular array. Each of the square grooves is slidably connected to an extrusion block 6. One side of the extrusion block 6 is inclined and the other side is flat. Each of the extrusion blocks 6 is connected to the movable outer ring 5 with a spring. One end of the extrusion block 6 is in contact with the drying outer cylinder 3. The outer wall of the drying outer cylinder 3 is provided with a number of discharge ports 301 in an annular array. The number of discharge ports 301 is the same as the number of square grooves. Each of the discharge ports 301 is symmetrically fixed with a rotating rod 302. A sealing plate 303 is rotatably connected between two rotating rods 302. A torsion spring is connected between the sealing plate 303 and the rotating rod 302. When the movable outer ring 5 and the extrusion block 6 move, they can contact the sealing plate 303.

[0022] When the produced activated alumina needs to be dried, the electric push rod 4 is first started. The output end of the electric push rod 4 drives the moving outer ring 5 to move along the outer wall of the drying outer cylinder 3. At this time, the spring is in a compressed state. When the bottom of the moving outer ring 5 moves to contact the sealing plate 303, the sealing plate 303 is subjected to force and rotates around the rotating rod 302. At this time, the torsion spring is under force. As the moving outer ring 5 continues to descend, when the extrusion block 6 in the square groove moves to the discharge port 301, the spring is no longer under force, driving the extrusion block 6 to move. The extrusion block 6 moves and contacts the sealing plate 303, pushing the sealing plate 303 to rotate again, and the torsion spring is under force again, until the extrusion block 6 pushes the sealing plate 303 to a vertical and horizontal state, sealing the discharge port 301 of the drying outer cylinder 3. This ensures the sealing during the subsequent drying of the produced activated alumina. The output end of the electric push rod 4 stops moving. At this point, the produced activated alumina is placed on the feeding tray 7. The inclined surface at the top of the feeding tray 7 allows the produced activated alumina to slide into the drying outer cylinder 3 and fall onto the support plate 13. It is worth noting that the diameter of the activated alumina is much larger than the through-hole of the support plate 13, preventing blockage. Because the distance between the feeding tray 7 and the support plate 13 is short, it will not deform or break due to its own weight. Since the top of the support plate 13 is inclined, the activated alumina falling onto the support plate 13 is pulled towards the inner wall of the drying outer cylinder 3 by the force of the inclined surface. It is worth noting that the produced activated alumina... The activated alumina has a low moisture content and moves smoothly under its own weight and the combined action of the inclined surface of the support plate 13. At this time, the electric heating plate 19 is activated, and it begins to heat up. The air in the gas delivery chamber 2 and the drying outer cylinder 3 is heated, causing increased molecular motion, volume expansion, and decreased density. The hot air rises and flows upward through the three sets of through holes on the support plate 13, heating and drying the activated alumina. To prevent the activated alumina containing moisture from sticking together during drying, the first drive motor 9 is activated. The output shaft of the first drive motor 9 drives the first rotating shaft 10 to rotate. The first rotating shaft 10 drives the scraper 12 to rotate through the fixing ring 11. The rotation of the scraper 12 stirs the activated alumina on the support plate 13, ensuring uniform heating. When the scraper 12 rotates, it drives the second rotating shaft 14, the stirring plate 15, and the gear 17 to revolve around the limiting ring plate 16. Since the gear 17 meshes with the internal gear ring 18, it will rotate along the teeth of the internal gear ring 18 while revolving, which in turn drives the second rotating shaft 14 and the stirring plate 15 to rotate synchronously. The stirring plate 15, which is long and short and arranged in opposite directions, rotates synchronously with the scraper 12, which can turn over the activated alumina accumulated between the drying outer cylinder 3 and the support plate 13. On the one hand, it can make the activated alumina containing moisture evenly heated, and prevent it from sticking together in the dead corner of the drying outer cylinder 3 and the support plate 13 due to local over-moisture. On the other hand, it can prevent the activated alumina containing moisture from adhering to the support plate 13 and the drying outer cylinder 3.This ensures subsequent quality and performance. Simultaneously, the second drive motor 21 is activated. The output shaft of the second drive motor 21 drives the third rotating shaft 22 to rotate. The third rotating shaft 22 drives the crank 23 to rotate. When the long end of the crank 23 rotates away from the suction housing 26, the first connecting rod 24 pulls, causing one end of the second connecting rod 25 to move the piston push plate 27. Through the pulling and pulling of the piston push plate 27 and the cooperation of the one-way valve 30, air in the drying outer cylinder 3 enters the suction housing 26 along the first pipe 28. When the long end of the crank 23 rotates closer to the suction housing... At 26 o'clock, the first connecting rod 24 pushes the second connecting rod 25 to move, causing the piston pusher plate 27 to squeeze inward. This, combined with the one-way valve 30, allows air inside the extraction housing 26 to be discharged from the opening of the second pipe 29. The air blows the electric heating plate 19, and the heat generated by the electric heating plate 19 heats the air. The air is then transported upward through the heat outlet and flows upward along the through-hole, further heating the activated alumina between the support plate 13 and the drying outer cylinder 3, improving heating efficiency and evaporating the moisture inside the activated alumina. The heated air remains in a continuously rising state. The annular inclined surface on the bottom outer wall of the feeding tray 7 can trap the rising hot air, preventing it from being directly discharged from the feeding tray 7. When the first pipe 28 is evacuating, it can extract the hot air trapped at the bottom of the feeding tray 7, allowing the rising hot air to be recycled, improving the utilization rate of the hot air and ensuring the drying effect. After the activated alumina is dried, the electric heating plate 19 and the second drive motor 21 are turned off. The electric heating plate 19 no longer generates heat, and the third rotating shaft 22 and crank 23 stop rotating. At this time, the output end of the electric push rod 4 resets and moves, driving the outer ring 5 to reset. The outer ring 5 moves, causing the extrusion block 6 to move until its inclined surface contacts the discharge port 301 of the drying outer cylinder 3. As the outer ring 5 moves, the extrusion block 6 is pressed into the square groove, compressing the spring. At this point, the torsion spring is no longer under force, causing the sealing plate 303 to reset and open. The activated alumina inside the drying outer cylinder 3 is then discharged from the discharge port 301 through the guide of the inclined surface of the bearing plate 13 and the rotational cooperation of the scraper 12 and the stirring plate 15, completing the drying of the activated alumina. The first drive motor 9 is then turned off, and the scraper 12 and the stirring plate 15 stop rotating.

[0023] The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the scope of protection of this utility model.

Claims

1. A drying device for producing activated alumina, comprising a support base (1), a gas conveying chamber (2), and a drying outer cylinder (3), wherein the top of several support bases (1) is fixedly connected to the gas conveying chamber (2), and the top of the gas conveying chamber (2) is fixedly connected to the drying outer cylinder (3), characterized in that: It also includes a feeding tray (7), a feeding tray (7) is fixed to one end of the inner wall of the drying outer cylinder (3), electric push rods (4) are symmetrically installed on the outer wall of the drying outer cylinder (3), the output ends of the two electric push rods (4) are fixed to a moving outer ring (5), the inner wall of the moving outer ring (5) is in contact with the outer wall of the drying outer cylinder (3), the drying outer cylinder (3) is provided with a stirring mechanism to prevent the active alumina from sticking and clumping, and a side plate (20) is fixed to one side of several support seats (1), and a drying mechanism for drying active alumina is provided on the side plate (20).

2. The drying apparatus for producing activated alumina according to claim 1, characterized in that: The stirring mechanism includes a connecting frame (8), the top of the drying outer cylinder (3) is fixedly connected to the connecting frame (8), the bottom of the connecting frame (8) is installed with a first drive motor (9), the output shaft of the first drive motor (9) is fixedly connected to a first rotating shaft (10), the inner wall of the drying outer cylinder (3) is fixedly connected to a bearing plate (13), the bearing plate (13) has three sets of through holes arranged in a ring array, the top center of the bearing plate (13) is rotatably connected to a fixing ring (11), the top of the fixing ring (11) is fixedly connected to the first rotating shaft (10), the outer wall of the fixing ring (11) is fixedly connected to several scrapers (12) in a ring array, the bottom of the scraper (12) is in contact with the inclined surface of the bearing plate (13), and one end of the scraper (12) is in contact with the inner wall of the drying outer cylinder (3).

3. The drying apparatus for producing activated alumina as described in claim 2, characterized in that: The stirring mechanism also includes a second rotating shaft (14), and the top of several scrapers (12) are rotatably connected to the second rotating shaft (14). Two stirring plates (15) are fixed to the outer wall of the second rotating shaft (14). The inner wall of the drying outer cylinder (3) is fixed to a limiting ring plate (16) by a locking block. The top of the second rotating shaft (14) is rotatably connected to the limiting ring plate (16). A gear (17) is fixed to the outer wall of the second rotating shaft (14). An internal gear ring (18) is fixed to the inner wall of the drying outer cylinder (3). One side of the gear (17) meshes with the internal gear ring (18).

4. The drying apparatus for producing activated alumina according to claim 3, characterized in that: The drying mechanism includes an electric heating plate (19), an electric heating plate (19) is installed at the bottom of the bearing plate (13), a second drive motor (21) is installed on several side plates (20), a third rotating shaft (22) is fixedly connected to the output shaft of several second drive motors (21), a crank (23) is fixedly connected to the top of the third rotating shaft (22), a first connecting rod (24) is rotatably connected to the crank (23), a second connecting rod (25) is rotatably connected to one end of the first connecting rod (24), and a piston push plate (27) is fixedly connected to one end of the second connecting rod (25).

5. The drying apparatus for producing activated alumina according to claim 4, characterized in that: The drying mechanism also includes a first pipe (28), the outer wall of the drying outer cylinder (3) is connected to the first pipe (28), the outer wall of the air supply chamber (2) is connected to the second pipe (29), the other end of the first pipe (28) and the other end of the second pipe (29) are connected to the suction housing (26), the second connecting rod (25) and the piston push plate (27) are located inside the suction housing (26) and are slidably connected to the suction housing (26), the ends of the first pipe (28) and the second pipe (29) away from the suction housing (26) are both fixed with a one-way valve (30), the one-way valve (30) is opened from top to bottom, the end of the second pipe (29) extending into the air supply chamber (2) is open upward and located on the side below the bearing plate (13) and the electric heating plate (19), the end of the first pipe (28) extending into the drying outer cylinder (3) is located on the side below the feeding tray (7).

6. The drying apparatus for producing activated alumina according to claim 5, characterized in that: It also includes an extrusion block (6), and the inner wall of the movable outer ring (5) is provided with a number of square grooves in an annular array. The extrusion block (6) is slidably connected in each of the square grooves. The extrusion block (6) is connected to the movable outer ring (5) with a spring. One end of the extrusion block (6) is in contact with the drying outer cylinder (3). The outer wall of the drying outer cylinder (3) is provided with a number of discharge ports (301) in an annular array. Rotating rods (302) are symmetrically fixed at each of the discharge ports (301). A sealing plate (303) is rotatably connected between two rotating rods (302). A torsion spring is connected between the sealing plate (303) and the rotating rod (302). The movable outer ring (5) and the extrusion block (6) can contact the sealing plate (303) when they move.

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